In Italian 1, in the answer field which should be blank (before I type in my answer) the correct answer is already populating the field, slightly grayed-out. This is on the website version, and the same problem appears for both chrome and safari.
This is what appears in difficult words, the idea is that it helps you when you have got the word wrong several times in a row.
Are you using Memrise Pro?
I believe this is happening outside of difficult words but am not certain at this time. When it recurs I will check.
I am a paid subscriber.
That happens when you do difficult words. The first few times the words are greyed out to help with your memory.